I have a garnet hill one I love with shorts. Similar to this butt mine is scoop necks:
https://www.garnethill.com/essential-three-quarter-sleeve-boatneck-tee/481867?offers_sku=44639%20CNVY%20M&SourceCode=DGW52B&utm_source=Google&utm_medium=cpc&utm_campaign=ACQ+PLA+Apparel&utm_content=ACQ+PLA+Apparel+ShirtsTops&gad_source=1&gclid=Cj0KCQjwsaqzBhDdARIsAK2gqndKIvzAWedVBPE8JQDJg_IZ9fDzf23vR8A3gOxpF4THobdpB36jkYMaAlFMEALw_wcB

Mine is a light cotton so not too hot. The other possibility is light weight peasant blouses or popover tops— I think those looks cute with shorts.

Anonymous wrote:Sezane has several options

https://www.sezane.com/us/product/theodora-t-shirt/red#size-XXS

https://www.sezane.com/us/product/lorna-t-shirt/navy#size-XS

https://www.sezane.com/us/product/hortense-t-shirt/black#size-XS

https://www.sezane.com/us/product/clea-t-shirt/ecru#size-XS

Great suggestions. I recently got the Theodora and it's very flattering. I sized up a bit as it's a bit form fitting. I'm 45.

https://www.everlane.com/products/womens-supima-micro-rib-scoop-neck-tee-heathered-fatigue

Scoop neck, but lovely

Ralph Lauren also has them:

https://www.macys.com/shop/featured/Ralph%20Lauren%20boat%20neck/Product_department,Sleeve_length/T-shirts,Short%20Sleeve

Another vote for the Jcrew perfect tee.

I also buy this one:

https://www.talbots.com/pima-v-neck--tee---solid/P231013041.html

Anonymous wrote:

Anonymous wrote:Kule has short sleeve tees that hit a couple of inches above the elbow. I find them to be pretty flattering on the arms.

OP. This is exactly what I’m looking for! So many colors! Have you purchased these before?
Are they true to size?

Yes, but they run wide and short. I’m 125 5’5” and wear a small. It’s quite wide when it arrives but shrinks to the perfect slightly boxy fit. It is straight cut

Anonymous wrote:

Anonymous wrote:Jcrew slim perfect-fit T-shirt, but note that it is cut slim through the torso.

This. And pick up swimming. You are too young for saggy arms

I agree. It’s weird because the only weight I’ve ever gained was during one pregnancy. I went back down to my regular weight (125) after pregnancy. I did join a pool this summer so I do plan on swimming laps.

Anonymous wrote:Kule has short sleeve tees that hit a couple of inches above the elbow. I find them to be pretty flattering on the arms.

OP. This is exactly what I’m looking for! So many colors! Have you purchased these before?
Are they true to size?

Anonymous wrote:Unless it's cut well, these are not going to look good. I would just get some casual button ups and roll up the sleeves.

+1 - t shirts with longer sleeves usually emphasize the extra weight; button downs (ups??) are much more flattering.

Kule has short sleeve tees that hit a couple of inches above the elbow. I find them to be pretty flattering on the arms.

Anonymous wrote:Jcrew slim perfect-fit T-shirt, but note that it is cut slim through the torso.

This. And pick up swimming. You are too young for saggy arms

The Nordstrom brand Caslon makes an elbow length t shirt with a ballet neckline that's really flattering.